New dylan command-interface completion and help

demo.txt

prom@horsey:/extra/Projects/opendylan/libraries/command-interface$ _build/bin/command-interface-demo
> 
Commands:
  configure - Modify configuration
  show - Show information
  echo - Command
  directory - Show information about directory
  examine - Command
  error - Fail miserably
  quit - Quit the shell
  help - Command
> show 
Commands:
  rule - Query rules
  log - Query logs
  route - Query routes
  interface - Query interfaces
  configuration - Query configuration
> show interface 
Parameters:
  protocol <protocol> - Filter interfaces by protocol
  type <type> - Filter interfaces by type
  verbose - Print verbose information
Value:
  <name> - Name of the interface
    eth0, eth1, eth2, eth3
> show interface eth0 verbose 
> help show interface 

  show interface
    Query interfaces

  Parameters:
    protocol <protocol>
      Filter interfaces by protocol
    type <type>
      Filter interfaces by type
    <name>
      Name of the interface
    verbose
      Print verbose information

>